<template>
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <img src="../assets/logo.png" alt="">
        <span>电商管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--页面主体区域-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--<div class="toggle-button" @click="isCollapse=!isCollapse">-->
        <!--<i :class="isCollapse?'el-icon-s-unfold':'el-icon-s-fold'"></i>-->
        <!--</div>-->
        <!--侧边栏菜单区域-->
        <el-menu
            background-color="#333744"
            text-color="#fff"
            active-text-color="#409EFF"
            unique-opened
            :collapse="isCollapse"
            :collapse-transition="false"
            router
            :default-active="activePath">
          <!--unique-opened是否只保持一个子菜单的展开-->
          <!--collapse是否水平折叠收起菜单-->
          <!--collapse-transition	是否开启折叠动画-->
          <!--router是否使用 vue-router 的模式，启用该模式会在激活导航时以 index 作为 path 进行路由跳转-->
          <!--default-active	当前激活菜单的 index-->

          <!--一级菜单-->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!--index只接受字符串，不接受数值-->
            <!--一级菜单模板区域-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--文本-->
              <span>{{ item.authName }}</span>
            </template>


            <!--二级菜单-->
            <el-menu-item :index=" '/' + subItem.path"
                          v-for="subItem in item.children"
                          :key="subItem.id"
                          @click="saveNavState('/' + subItem.path)">
              <!--二级菜单模板区域-->
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--右边主要内容-->
      <el-main>
        <!--路由占位符-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: "Home",
  data() {
    return {
      //左侧菜单数据
      menuList: [],
      iconsObj: {
        '125': 'iconfont icon-users',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao',
      },
      //左侧菜单是否折叠
      isCollapse: false,
      //被激活链接的地址
      activePath: '',
    }
  },
  created() {
    //页面被创建时，获取所有的菜单
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      //清空token
      window.sessionStorage.clear();
      //跳转到登录页
      this.$router.push('./login');
    },
    //获取所有的菜单
    async getMenuList() {
      const {data: res} = await this.$axios.get('menus');
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data;
      // console.log(res);
    },
    //点击按钮，切换菜单折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    //保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}


.el-header {
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  background-color: #373D41;
  color: #fff;
  font-size: 20px;
}

.el-header div {
  display: flex;
  align-items: center;
}

.el-header div span {
  margin-left: 15px;
}

.el-header img {
  width: 50px;
}

.el-aside {
  background-color: #333744;

  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #EAEDF1;
}

.iconfont {
  margin-right: 10px;
}

//一种图标
.toggle-button {
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #ffffff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}

//两种图标
//.toggle-button {
//  background-color: #4a5064;
//  font-size: 20px;
//  line-height: 40px;
//  color: #ffffff;
//  text-align: center;
//  cursor: pointer;
//}
</style>